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Description of Business and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Schedule of cash, cash equivalent and restricted cash
(in thousands)  June 30,
2021		   December 31,
2020		 
Cash and cash equivalents  $81,912   $63,560 
Restricted cash – current   48    48 
Restricted cash – long-term   392    391 
Cash, cash equivalents and restricted cash  $82,352   $63,999 

 
Schedule of antidilutive securities excluded from computation of diluted net loss per share
(in thousands)  June 30,
2021		   June 30,
2020		 
Options   859    365 
Warrants   2,114    2,871 
Total   2,973    3,236